What kind of energy does an electromagnet use to pick up metallic objects?

Aforce of 200 n is applied to an input piston of cross-sectional area 2 sq. cm pushing it downward 2.8 cm. how far does the output piston of cross-sectional area 12 sq. cm move upward? show all work.

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?